MODELING AND NON-LINEAR MECHANISMS IN HETEROGENEOUS KINETICS OF THE NON-ISOTHERMAL PYROLYSIS OR HYDROPYROLYSIS FOR TARFAYA OIL SHALE (MOROCCO)

Abstract

The method of analysis to reach the kinetic parameters of pyrolysis or hydropyrolysis in non-isothermal (dynamic regime) has been often discussed to try to approach the reaction mechanisms. Indeed by modifying the method one makes these kinetic parameters vary considerably. Two mechanisms have been presented to discuss these non-isothermal kinetics for pyrolysis under nitrogen and hydropyrolysis under hydrogen, we have the linear mechanism and the non-linear mechanism.The method that was adopted for this work is the Coast-Redfern approximation (A.W.Coast and D.P.Redfern: 1964). We were able to achieve these kinetic parameters and design the appropriate mechanisms for the dynamic pyrolysis and hydropyrolysis of the Tarfaya oil shale (Morocco) for the Z4 layer. It turned out after discussion that it is the non-linear mechanism that fits best with pyrolysis as well as hydropyrolysis in non-isothermal mode. These two reactions are carried out by several simultaneous reactions with a fractional order for the first and an order equal to unity for the latter.